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| author |   Tyrel Datwyler <tyreld@linux.ibm.com> | 2020-08-20 18:46:38 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-09-04 18:09:44 +0200 |
| commit | 63ffcbdad738e3d1c857027789a2273df3337624 (patch) | |
| tree | acf9c5aaae4a49c87a70c56d07b58392318f13f1 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | tty: ipwireless: fix error handling (diff) | |
| download | wireguard-linux-63ffcbdad738e3d1c857027789a2273df3337624.tar.xz wireguard-linux-63ffcbdad738e3d1c857027789a2273df3337624.zip | |
tty: hvcs: Don't NULL tty->driver_data until hvcs_cleanup()
The code currently NULLs tty->driver_data in hvcs_close() with the
intent of informing the next call to hvcs_open() that device needs to be
reconfigured. However, when hvcs_cleanup() is called we copy hvcsd from
tty->driver_data which was previoulsy NULLed by hvcs_close() and our
call to tty_port_put(&hvcsd->port) doesn't actually do anything since
&hvcsd->port ends up translating to NULL by chance. This has the side
effect that when hvcs_remove() is called we have one too many port
references preventing hvcs_destuct_port() from ever being called. This
also prevents us from reusing the /dev/hvcsX node in a future
hvcs_probe() and we can eventually run out of /dev/hvcsX devices.
Fix this by waiting to NULL tty->driver_data in hvcs_cleanup().
Fixes: 27bf7c43a19c ("TTY: hvcs, add tty install")
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Link: https://lore.kernel.org/r/20200820234643.70412-1-tyreld@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions